5n=30+3n You need to exclude the 4 due to for the first 4GB cost $30 then $3 for each additional GB used
Answer:
840
Step-by-step explanation:
Given


Required
Determine the number of rankings
The term "ranking" as used in this question implies permutation and the required is calculated using:

Where


So:






<em>Hence, number of ranking is 840</em>